Writing instrument



FIG. 1 is a front elevational view of the writing instrument of this invention;

FIG. 2 is a left side elevational view of the writing instrument of this invention, the right side elevational view being a mirror image thereof;

FIG. 3 is a rear elevational view of the writing instrument of this invention;

FIG. 4 is a top plan view of FIG. 2 of the writing instrument of this invention; and,

FIG. 5 is a bottom plan view of FIG. 2 of the writing instrument of this invention. 

The ornamental design for a writing instrument, as shown and described. 